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TPS62180 Datasheet(PDF) 8 Page - Texas Instruments |
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TPS62180 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 35 page 1 1 3 1 3 3 1 7 SW1 SW2 FB* VIN2 1 EN* SS/TR PG HS1 HS2 phase shift HS2 power control Power Save Mode HS1 gm VREF master follower PG control Thermal Shutdown UVLO control logic delay off-timer VIN tm tf gmout VO VIN 3 VIN1 VIN1 VIN2 VO GND *Pin is connected to a pull down resistor internally (see Feature Description section) AEE TM HICCUP VIN 60 EN gate drive R1 R2 TPS62180, TPS62182 SLVSBB8A – AUGUST 2014 – REVISED AUGUST 2014 www.ti.com Functional Block Diagram (continued) Figure 7. TPS62182 (Fixed output voltage) 9.3 Feature Description 9.3.1 Enable / Shutdown (EN) The device starts operation, when VIN is present and Enable (EN) is set High. The EN threshold is 1 V for rising and 0.9 V for falling voltages, providing a threshold accuracy of ±3%. That makes it suitable for precise switching on and off in accurate power sequencing arrangements as well as for slowly rising EN control voltage signals (see Using the Accurate EN Threshold for more details). The device is disabled by pulling EN Low. A discharge resistor of about 60 Ω is then connected to the output. At the EN pin, an internal pull down resistor of about 350 k Ω keeps the Low state, if EN gets high impedance or floating afterwards. The EN pin can be connected to VIN to always enable the device. A delay of 1 ms, after VIN exceeds VUVLO, ensures safe operating conditions before the device starts switching. If VIN is already present, a soft start sequence is initiated about 100 µs after EN is pulled High. 9.3.2 Soft Start / Tracking (SS/TR) The soft start circuit controls the output voltage slope during startup. This avoids excessive inrush current and ensures a controlled output voltage rise time. It also prevents unwanted voltage drop from high impedance power sources or batteries. When EN is set to start device operation, the device starts switching and VOUT rises with a slope, controlled by the external capacitor connected to the SS/TR pin. It is not recommended to leave the SS/TR pin floating, because VOUT may overshoot. Typical startup operation is shown in Application Performance Curves. 8 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: TPS62180 TPS62182 |
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